Import patches-unapplied version 0.6.5.9-5ubuntu2 to ubuntu/zesty-proposed

Imported using git-ubuntu import.

Changelog parent: b028dcf54d12be606c9a6b374b8146c222a9b549

New changelog entries:
* In the spirit of the dropped change from 0.6.5.7-0ubuntu3, don't
recommend zfs-modules on 32-bit arches. This is technically not
correct, but we also don't/can't support ZFS on 32-bit without a
great deal of upstream work documented by zfsonlinux developers.